Embodiments disclosed herein relate to a high frequency connector system with reduced stub lengths that provide improved performance at high frequencies. A first connector includes a plurality of mating contacts designed to electrically connect to a second plurality of mating contacts associated with a second connector. The first connector includes one or more elastic members such that when the second connector is mated to the first connector, the one or more elastic members are compressed between the first and second connectors. The first and second plurality of contacts overlap by a first distance when initially mated, but when the connectors are released, the first elastic member biases the second connector away from the first connector such that the first and second plurality of contacts overlap by a second distance smaller than the first distance.
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#2# 9. An interconnection system, comprising:
a first connector and a second connector configured to be mated to the first connector,
wherein:
the first and second connectors comprise a first and second plurality of contacts respectively and are configured with a travel distance,
the first connector and the second connector are constructed and arranged to bias the second connector away from the first connector when the second connector is mated to the first connector such that the first and second plurality of contacts overlap to provide a stub length shorter than the travel distance.
#2# 1. A connector comprising:
a mating interface adapted to mate with a second connector pressed toward the connector in a mating direction, the mating interface comprising a plurality of mating contacts; and
a latching member positioned to engage a complementary latching member of the second connector,
wherein the latching member is positioned with respect to the plurality of mating contacts such that the second connector is positioned with respect to the plurality of mating contacts by the latching member,
wherein the connector is constructed and arranged to bias the second connector away from the first connector with a force of at least 10N when the second connector is inserted into the first connector to a position of maximum insertion, such that the second connector is biased into a second position with respect to the first connector based on the latching member.
#2# 5. A connector comprising:
a mating interface adapted to mate with a second connector pressed toward the connector in a mating direction, the mating interface comprising a first plurality of mating contacts and configured to provide a position of maximum insertion of the second connector when mated with the first connector;
a latching member positioned to engage a complementary latching member of the second connector,
wherein:
the latching member is positioned with respect to the first plurality of mating contacts such that the second connector is positioned with respect to the plurality of mating contacts by the latching member, and
the connector is constructed and arranged to urge the second connector into a second position established by engagement of the latching member and the complementary latching member, the second position offset from the position of maximum insertion so as to establish a separation of the connector and the second connector and a stub length at the mating interface of the first plurality of mating contacts and a second plurality of mating contacts of the second connector less than 2 mm.
#2# 21. A method of operating an interconnection system comprising a first connector and a second connector, wherein the first and second connectors comprise respective mating contacts, the method comprising:
positioning the first and second connectors with the mating contacts of the first and second connectors engaged,
with the mating contacts of the first and second connectors engaged, moving the second connector toward the first connector in a mating direction, so as to store spring energy in the interconnection system and wipe the mating contacts from the second connector with respect to the mating contacts of first connector for a travel distance,
releasing the second connector such that the stored spring energy moves the second connector moves away from the first connector along the mating direction with the mating contacts of the first and second connectors engaged;
arresting movement of the second connector away from the first connector by engaging latching features of the first connector and latching features of the second connector such that the mating contacts of the first connector are positioned relative to the mating contacts of the second connector based on the position of the latching features of the first connector and the second connector, such stub lengths of the mating contacts of the first and second connectors are less than the travel distance.
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This application is a continuation of U.S. application Ser. No. 16/516,619, filed on Jul. 19, 2019, entitled “HIGH FREQUENCY CONNECTOR WITH KICK-OUT,” which claims priority to and the benefit under 35 U.S.C. § 119(e) of U.S. Provisional Application Ser. No. 62/701,400, filed on Jul. 20, 2018, entitled “HIGH FREQUENCY CONNECTOR WITH KICK-OUT”. The entire contents of these applications are incorporated herein by reference in their entirety.
Disclosed embodiments are related to improvements to latched plug connectors, such as may be used in electrical systems.
Electrical connectors are designed to facilitate the physical connection between two conductors to allow an electrical signal to pass between the two. Some electrical connectors include one or more latches that engage with reciprocal features on a corresponding mating connector. When the connectors are mated, the latch and reciprocal feature engage to ensure that the connectors do not become inadvertently disconnected.
According to some embodiments, a connector comprises a mating interface adapted to mate with a second connector pressed towards the connector in a mating direction, the mating interface comprising: a plurality of contacts; an elastic member adjacent the mating interface positioned with respect to the mating interface to be deformed in the mating direction by the second connector when mated with the connector; and a latching member positioned to engage a complementary latching member of the second connector. The latching member is positioned with respect to the plurality of mating contacts such that the second connector is positioned with respect to the plurality of mating contacts by the elastic member and the latching member.
In another aspect, the connector is embodied as part of an interconnection system comprising: a first connector and a second connector configured to be mated to the first connector, wherein the first and second connectors each comprise a first and second plurality of contacts and are configured with a travel distance, wherein the first connector comprises a first elastic member, and the first elastic member is constructed and arranged to bias the second connector away from the first connector when the second connector is mated to the first connector such that the first and second plurality of contacts overlap to provide a stub length shorter than the travel distance.
In yet another aspect, the connector is embodied within a connector assembly comprising: a first connector and a second connector, wherein one of the first and second connectors comprises a plug on a cable assembly comprising a cable configured for operation at frequencies in excess of 15 GHz, the second connector being constructed and arranged to be mated to the first connector, and the first connector comprises a latch receiving opening, and the second connector comprises a latch with a lock tab, wherein the first connector further comprises a first elastic member, the first elastic member being constructed and arranged to bias the second connector away from the first connector when mated to the first connector causing the lock tab to engager with the latch receiving surface.
According to another aspect, a connector can be used in a method of operating an interconnection system comprising a first connector and a second connector, wherein the first connector has mating contacts positioned to engage with mating contacts in the second connector, the method comprising: inserting the second connector into the first connector such that an elastic member is compressed between the first connector and the second connector, releasing the second connector such that the elastic member presses the second connector away from the first connector; engaging latching features of the first connector and latching features of the second connector such that the mating contacts of the first connector are positioned relative to the mating contacts of the second connector based on the position of the latching features of the first connector and the second connector.
It should be appreciated that the foregoing concepts, and additional concepts discussed below, may be used separately or together in any suitable combination, as the present disclosure is not limited in this respect. Further, other advantages and novel features of the present disclosure will become apparent from the following detailed description of various non-limiting embodiments when considered in conjunction with the accompanying figures.
The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. In the drawings:
The inventors have recognized and appreciated that improved performance of a connector may be achieved with a “kick-out.” The kick-out urges mated connectors apart such that the mated position of the connectors is set by a latching mechanism on the connectors. The latching mechanism may establish the relative position of the mated connectors, and along with them, the mating contacts within the connectors. The mating contacts may be positioned relative to the latching mechanisms such that, when the connectors are blocked by the latching mechanisms from separating further, the mating contacts will be engaged with only short electrical stub length, contributing to desirable electrical performance, particularly at high frequencies. Nonetheless, as the connectors are pushed together, before they are urged apart by the kick-out, there may be substantial wipe, which further contributes to connector performance.
A “stub” is a conducting branch in a signal path that is open at the end. The stub is undesirable because signal energy propagating down the signal path will split at the branch, such that part of the energy propagates down the stub. At the end of the stub, the signal energy is reflected back toward the signal path where it mixes with and interferes with the desired signal. The severity of that interference depends on the length of the stub in relation to the wavelength of the signal energy. When the length of the stub approximates one half of the wavelength, the interference can be particularly severe because the reflected energy from the stub cancels out some portion of the signal energy.
A stub arises in an electrical connector, for example, when a mating contact shaped as a beam mates with a mating contact shaped as a pad. The connector cannot be manufactured such that the beam will reliably touch the end of the pad. Rather, the connector is designed such that the beam mates with the pad at a distance offset from the end that exceeds the variance in positioning of the beam and pad that will arise during use of the connector. That positioning ensures that, even with the maximum variance in positioning, the beam and pad still mate. However, the portion of the pad between its distal tip and the contact point with the beam remains as a stub.
Further, during a mating sequence, it is desirable for the conducting elements of each conductor to make initial contact prior to the connectors being fully mated and for the conductors to slide along each other for a certain distance before the connectors are fully mated. This distance between where the conductors first contact and where the conductors connect when finally mated is known as the travel distance or the wipe length, but for the purposes of this disclosure it will be referred to as the travel distance. This sliding removes contaminates, like dirt or oxides, from the contact surfaces. Hence, having a travel distance can be beneficial for electrical performance. Nonetheless, the travel distance corresponds to the length of the stub that is left when the conducting elements are in their mated position.
Connectors might be designed with a nominal travel distance of 2 to 5 mm. Such a travel distance in a conventional connector corresponds to stub around a half wavelength for signals at frequencies above 30 GHz. As many modern connectors operate with signal frequencies in that range, the stub length is long enough to create significant interference with the signals at the operating frequency of the connector.
A connector with kick-out can still have travel distances as in the prior art, if desired. However, once the connectors are not being actively pressed together, the kick-out will separate the connectors to a controlled position in which the stub length is less than the travel distance. Such connectors can be reliably designed for operating at high frequencies, such as above 15 GHz, for example in the range of 30 to 120 GHz, or up to 112 GHz or up to 80 GHz.
In some embodiments, the kick-out may be implemented as one or more elastic elements between the connectors. A first connector may include a mating interface adapted to mate with a second connector when the second connector is pressed towards the first connector in a mating direction. The first connector may include at least a first elastic member adjacent the mating interface, positioned with respect to the mating interface such that the elastic member is deformed in the mating direction when the two connectors are pressed together. For purposes of this disclosure, the mating direction of each connector is defined as towards the other connector. The elastic member continuously biases the second connector opposite the mating direction or away from the first connector. The second connector is biased into a latched position that both reduces stub length and ensures a consistent mating between the two connectors, as will be described below.
In some embodiments, in the process of mating a first connector to a second connector, the mating ends of the respective connectors are brought together. As the first and second connector come together, the contacts of the first connector make initial contact with the contacts of the second connector. As the connectors mate, the contacts of the first connector wipe along the contacts of the second connector. Also, at least one latching member of the first connector makes initial contact with the housing of the second connector.
The head of the latching member is beveled, rounded, curved, or otherwise outwardly sloped to form a lock tab such that when the head encounters a component of the second connector, the latching member is forced away from that component. The latching member can continue to slide with the latching member head in contact with a component of the second connector as the connectors mate, until the latching member reaches a window in a latching component of the second connector. That latching component may be, for example, a surface of the housing or a portion a of a shield surrounding the housing. Due to the elasticity of the latching member, the latching member springs back into a position with the head of the latching member extending at least into, and potentially partially through, the window of the second connector. The connectors may reach a maximum mating depth when the housings of the connectors prevent additional movement towards each other.
As will be further described, when a user releases the two connectors, the second connector is then biased by at least one elastic member between the connectors in a direction opposite of the mating direction such that the first and second connectors may separate slightly. As the connectors separate, a flat mating surface of the lock tab, facing the opposite the mating direction, encounters a latch receiving surface at an edge of the window, preventing the latching member from moving further in a direction opposite the mating direction.
Prior to the movement of the second connector as a result of the elastic members, the contacts of the first connector were at a first overlap length with the contacts of the second connector when the connectors were in the initial mated position. As the connectors separate due to biasing from the elastic members, the first contacts wipe in a direction opposite the mating direction against the second contacts until the connectors enter a latched position when the latching surface meets the latch receiving surface. In the latched position, the first contacts and the second contacts overlap by a second overlap length, shorter than the first length, reducing the remaining stub length of the second contacts.
In some embodiments of the connector, the connector includes at least a first and second elastic member. In these embodiments, a projection of the housing of the first connector extends from the housing in a direction perpendicular to the mating direction. The first elastic member is an elongated member wrapped at least partially around the projection. The elastic member is secured to the connector by a cage in some embodiments such that the elastic member is held between the cage and the housing. The elongated member can comprise a central portion flanked by a first end portion and a second end portion. When the elastic member is in a rest state prior to being reversibly deformed by the second connector, the first end portion and the second end portion of the elastic member extend above the projection in a direction opposite the mating direction. When the second connector is mated to the first connector, the second connector presses the elastic member in the mating direction, reversibly deforming the central portion in the mating direction. Due to the elastic nature of the elastic member, when the user releases the second connector, the elastic member biases the second connector away from the first connector such that the latching surface engages with the latch receiving surface.
The kick-out components may generate a force at least as great as the de-mate force of the connectors, for example, at least 20N. For the purposes of this disclosure, de-mate force can be defined as the force sufficient to cause the first and second connectors, while in the mated position, to move opposite the mating direction. The required force may be generated by selection of the spring constant of the elastic members forming the kick-out. In some embodiments the force exerted by the elastic members collectively may be less than or equal to 50N, less than or equal to 40N, less than or equal to 30N, less than or equal to 20N, less than or equal to 10N, or less than or equal to 5N. In some embodiments, the force may be greater than or equal to 5N, greater than or equal to 10N, greater than or equal to 20N, greater than or equal to 30N, greater than or equal to 40N, or greater than or equal to 50N, Combinations of the above-referenced ranges are also possible (e.g., greater than or equal to 5N and less than or equal to 50N).
Turning to the figures, specific non-limiting embodiments are described in further detail. It should be understood that the various systems, components, features, and methods described relative to these embodiments may be used either individually and/or in any desired combination as the disclosure is not limited to only the specific embodiments described herein.
In the embodiment illustrated, a cage 202 surrounds housing 214, with side walls 250 and end walls 252. Cage 202 has contact tails at the mounting interface of connector 200. With these tails, cage 202 may be conductive and grounded, such that cage 202 may provide a shielding function. Additionally, cage 202 may be shaped to act as a latching component. Windows 210 in the cage 202 may receive latching members from the second connector as will be described below. Cage 202 may be formed from a sheet of metal or other suitable material.
Connector 200 may be shaped to support one or more elastic members to provide kick-out. In this example, housing 214 has projections 206 for that purpose. Projections 206 extend from the housing perpendicularly to the mating direction. In the example of
In the embodiment illustrated, two elastic members are shown. Each is formed of an elongated member that has been bent into a shape that will deform and generate a spring force. The elastic members may be formed of any material that will elastically deform, but preferably does not yield, when compressed during mating of the connectors. Many metals may be suitable for this purpose.
First elastic member 204 is positioned adjacent one side of the mating interface 216, while the second elastic member 208 is positioned adjacent the opposite side of the mating interface 216. The elastic members are positioned with respect to the mating interface to be deformed in the mating direction by a second or plug connector when mated with the first connector.
Elastic members may be secured to connector 200 in any suitable way. Side walls 250 of cage 202 covers an end of the projections 206, aiding in securing the elastic members. In the embodiment illustrated, elastic members 204 and 208 are wrapped around portions of all four sides of projections 206. The ends of projections 206 are bounded by, at one end, a wall of housing 214 and, at the other end, cage 202. In this way, elastic members are secured to connector 200, though portions of the elastic members 204 and 208 may move perpendicular to the mating direction.
As can be seen, central portion 302 of the elastic member 204 is bowed, with the apex of the bow contacting projection 206. With a mating connector pressed against elastic member 204, the ends of central portion 302 are similarly pressed towards projection 206, elastically deforming elastic member 204, causing it to exert a counter spring force on the mating connector 300. Elastic member 204 can be seen to be in a compressed state in
First end portion 304 and second end portion 306 of the elastic member wrap around the projection 206. When in a resting, undepressed, state first end portion 304 and second end portion 306 extend above projection 206 in a direction opposite the mating direction. 302. First end portion 304 and second end portion 306 engage the surface of a mating connector such that, when a mating connector is pressed by a user into connector 300, the ends of central portion can be deformed towards the projection 206 in the mating direction.
During mating, a user may press connectors 200 and 300 together until the state shown in
The initial insertion depth, as illustrated in
In the mated configuration of
In
As can be seen in
Windows 210 and latching members 502 and 504 are sized and positioned on connector 200 and 300, respectively, such that when connectors 200 and 300 are in the position illustrated in
In contrast,
The rear edges of the projections of latching members 502 and 504, abutting the edges of windows 210, may be perpendicular to the surface of the side 250 or otherwise shaped to hook on the edge of the windows 210. Regardless of the precise configuration of the projection, because the projections at least partially extend into the windows 210, they hook on the edges of the windows and preclude connector 300 from being further kicked out. Thus, the connectors 200 and 300 are pushed into this position, set by the positions of the latching components by the elastic members 204 and 208. The mating contacts of connectors 200 and 300 are positioned relative to the latching components so that the stub length is small when the connector is in this configuration.
The elongated member 620 may be formed from a springy material, such as a metal sheet. As shown, the projection has a tapered leading portion which will press the projection away from surface 250 until the projection enters window 210. Once projection enters window 210, that pressure will be removed and the springiness of elongated member 620 will force the projection into window 210, as shown in
In contrast,
The mating contacts of connector 300 are represented by contact array 600, which is shown in cross section. The contact array, for example, may be a paddle card carrying contacts 402 as shown in
Mating contacts from connector 200 are shown as contacts 602, which are here shown as surface mounted beams. However, the exact configuration of the contacts is not critical to the invention. Regardless of the exact shape, the contacts from connector 200 and connector 300 have a contact location. The contact location is here shown be reference line 606a. The distance between reference line 606a and reference line 604 represents the travel distance and also the stub length when connector 300 has been fully inserted into connector 200.
The contact location in the configuration of
As a comparison of
The contacts of the first connector are positioned relative to the contacts of the second connector based on the relative position of the latching features of the first and second connectors. Similarly, the separation of the first and second connectors is established by the relative positions of the latching features. According to some embodiments, the first connector is inserted into the second connector such that the elastic members are compressed between the two connectors. The user then releases the connectors such that the elastic members bias the second connector away from the first connector, causing the latching surface of the second connector to engage the latch receiving surface of the first connector. The movement of the connectors away from each other changes the relative positions of the first and second contacts, reducing the stub length. In some embodiments, the stub length in the operating condition of the connector may be 1.5 mm, for example. Additionally, the contacts are wiped with respect to each other a second time, with the first time in the mating direction when the connectors were initially mating for a first travel distance of 2 mm, and a second time in the opposite direction as a result of entering the latched position in a second travel distance less than the first travel distance.
In some embodiments the final stub length in the latched position may be 5 mm, less than or equal to 4 mm, less than or equal to 3 mm, less than or equal to 2 mm, less than or equal to 1.5 mm, less than or equal to 1 mm. In some embodiments, the stub length may be greater than or equal to 1 mm, greater than or equal to 1.5 mm, greater than or equal to 2 mm, greater than or equal to 3 mm, greater than or equal to 4 mm, or greater than or equal to 5 mm. Combinations of the above-referenced ranges are also possible (e.g., greater than or equal to 1 mm and less than or equal to 5 mm). Other ranges are also possible.
In some embodiments the initial travel distance when the connectors are entering the initial latched position may be up to 10 mm, up to 9 mm, up to 8 mm, up to 7 mm, up to 6 mm, up to 5 mm, up to 4 mm, up to 3 mm, or up to 2 mm, in various embodiments. In some embodiments, the initial travel distance may be greater than or equal to 2 mm, greater than or equal to 3 mm, greater than or equal to 4 mm, greater than or equal to 5 mm, or greater than or equal to 6 mm, greater than or equal to 7 mm, greater than or equal to 8 mm, greater than or equal to 9 mm, or greater than or equal to 10 mm. Combinations of the above-referenced ranges are also possible (e.g., greater than or equal to 2 mm and less than or equal to 10 mm). Other ranges are also possible.
It should be understood that while specific male and female connectors are described, the current disclosure does not specifically focus on a single of the two connectors or even necessarily describes the connectors as separate entities. The two connectors could be embodied as separate connectors, or as parts of a single connector assembly.
The interlocking system including the latching interface and the elastic members biasing the connectors into a locked position can also be a system separate to the physical depicted embodiments of the two connectors. One of skill in the art should understand that the teachings provided can be applied to different connector shapes and systems than those expressly outlined here and the current disclosure should not be limited to the structures and shapes described.
While the depicted and described embodiments show a first and second elastic member, it should be understood by one of skill in the art that any number of elastic members can be used as long as the elastic member(s) are capable of generating the necessary de-mate force to bias the connectors into the latched position.
The improved electrical performance of the described connectors are contemplated for operation at frequencies in excess of 15 GHz. However, frequencies of below 15 GHz are also contemplated. At frequencies of 10-15 GHz, the connector is contemplated to have an impedance variation of less than ±5%.
Various aspects of the present disclosure may be used alone, in combination, or in a variety of arrangements not specifically discussed in the embodiments described in the foregoing and is therefore not limited in its application to the details and arrangement of components set forth in the foregoing description or illustrated in the drawings. For example, aspects described in one embodiment may be combined in any manner with aspects described in other embodiments.
Also, the embodiments described herein may be embodied as a method, of which an example has been provided. The acts performed as part of the method may be ordered in any suitable way. Accordingly, embodiments may be constructed in which acts are performed in an order different than illustrated, which may include performing some acts simultaneously, even though shown as sequential acts in illustrative embodiments.
Further, some actions are described as taken by a “user.” It should be appreciated that a “user” need not be a single individual, and that in some embodiments, actions attributable to a “user” may be performed by a team of individuals and/or an individual in combination with computer-assisted tools or other mechanisms.
While several embodiments of the present invention have been described and illustrated herein, those of ordinary skill in the art will readily envision a variety of other means and/or structures for performing the functions and/or obtaining the results and/or one or more of the advantages described herein, and each of such variations and/or modifications is deemed to be within the scope of the present invention.
For example, inventive concepts are illustrated with respect to a vertical connector assembly that is designed for attachment to a printed circuit board using surface mount technology. However, the kick-out as described herein may be used with right angle connectors and/or with connectors attached to a board using other technologies, such as press fit or BGA attachments.
Moreover, the kick-out is illustrated in connection with a receptacle adapted to receive a plug of a cable assembly. The techniques described herein may be used with other styles of connectors, including backplane connectors and mezzanine connectors, and other connectors configured to join two printed circuit board.
As an example of another variation, in some embodiments, the elastic members were described as spring clips. However, helical springs, chunks of elastic material, or any other structure capable of generating a spring force may alternatively or additionally be used.
Further, it should be appreciated that embodiments were illustrated in which elastic members were attached to a receptacle and latches were attached to a plug. These features may be on either or both of the mating connectors.
As yet another example, mating connectors were illustrated as a plug and receptacle. In connection with such an embodiment, relative motion of the connectors was sometimes described as insertion or removal of the plug from the receptacle. While such a mode of operation is common, the invention is not limited to embodiments in which a plug is pushed towards a receptacle, as the techniques described herein operate regardless of which component is fixed and which is moving.
As yet another example, latching members 502 and 504 may be formed on a single elongated member 620 or two separate elongated members may be used.
More generally, those skilled in the art will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the teachings of the present invention is/are used. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the invention described herein. It is, therefore, to be understood that the foregoing embodiments are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, the invention may be practiced otherwise than as specifically described and claimed. The present invention is directed to each individual feature, system, article, material, kit, and/or method described herein. In addition, any combination of two or more such features, systems, articles, materials, kits, and/or methods, if such features, systems, articles, materials, kits, and/or methods are not mutually inconsistent, is included within the scope of the present invention.
The indefinite articles “a” and “an,” as used herein in the specification and in the claims, unless clearly indicated to the contrary, should be understood to mean “at least one.”
As used herein in the specification and in the claims, “or” should be understood to have the same meaning as “and/or” as defined above. For example, when separating items in a list, “or” or “and/or” shall be interpreted as being inclusive, i.e., the inclusion of at least one, but also including more than one, of a number or list of elements, and, optionally, additional unlisted items. Only terms clearly indicated to the contrary, such as “only one of” or “exactly one of,” or, when used in the claims, “consisting of,” will refer to the inclusion of exactly one element of a number or list of elements. In general, the term “or” as used herein shall only be interpreted as indicating exclusive alternatives (i.e. “one or the other but not both”) when preceded by terms of exclusivity, such as “either,” “one of,” “only one of,” or “exactly one of.” “Consisting essentially of,” when used in the claims, shall have its ordinary meaning as used in the field of patent law.
As used herein in the specification and in the claims, the phrase “at least one,” in reference to a list of one or more elements, should be understood to mean at least one element selected from any one or more of the elements in the list of elements, but not necessarily including at least one of each and every element specifically listed within the list of elements and not excluding any combinations of elements in the list of elements. This definition also allows that elements may optionally be present other than the elements specifically identified within the list of elements to which the phrase “at least one” refers, whether related or unrelated to those elements specifically identified. Thus, as a non-limiting example, “at least one of A and B” (or, equivalently, “at least one of A or B,” or, equivalently “at least one of A and/or B”) can refer, in one embodiment, to at least one, optionally including more than one, A, with no B present (and optionally including elements other than B); in another embodiment, to at least one, optionally including more than one, B, with no A present (and optionally including elements other than A); in yet another embodiment, to at least one, optionally including more than one, A, and at least one, optionally including more than one, B (and optionally including other elements); etc.
It should also be understood that, unless clearly indicated to the contrary, in any methods claimed herein that include more than one step or act, the order of the steps or acts of the method is not necessarily limited to the order in which the steps or acts of the method are recited.
In the claims, as well as in the specification above, all transitional phrases such as “comprising,” “including,” “carrying,” “having,” “containing,” “involving,” “holding,” “composed of,” and the like are to be understood to be open-ended, i.e., to mean including but not limited to. Only the transitional phrases “consisting of” and “consisting essentially of” shall be closed or semi-closed transitional phrases, respectively, as set forth in the United States Patent Office Manual of Patent Examining Procedures, Section 2111.03.
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